Something I've wanted to work on. Since I completed the loose US set a few years ago, I've been slowly adding variants as I find them.
I may also make random notes here. If you find something I don't have, please let me know. Also random questions and discussion welcome!
List I have so far:
Ace of Aces
Alien Brigade
Asteroids (might be an italics variant out there)
Ballblazer
Ballblazer (red end label)
Basketbrawl
Centipede (might be an italics variant/color pic variant out there)
Choplifter
Commando
Crack'ed
Crossbow
Dark Chambers
Desert Falcon
Dig Dug (regular top text)
Dig Dug (italics top text)
Donkey Kong
Donkey Kong Jr.
Double Dragon
F-18 Hornet
Fatal Run
Fight Night
Food Fight
Food Fight (bold end label; fixed the game crash issue)
Galaga (might be an italics variant/color pic variant out there)
Hat Trick
Ikari Warriors
Impossible Mission
Jinks
Joust (might be an italics variant/color pic variant out there)
Karateka
Kung-Fu Master
Mario Bros
Mat Mania Challenge
Mean 18 Ultimate Golf
Meltdown
Midnight Mutants
Motor Psycho
Ms. Pac-Man (regular copyright text)
Ms. Pac-Man (italics copyright text)
Ninja Golf
One-On-One Basketball (regular copyright text)
One-On-One Basketball (italics copyright text)
Pete Rose Baseball
Planet Smashers
Pole Position II (1984 copyright)
Pole Position II (1986 copyright)
Pole Position II (1987 copyright)
Pole Position II (MFG Date sticker 090888)
Pole Position II (MFG Date sticker 092088)
Pole Position II (silver label)
Rampage
Realsports Baseball (white text)
Realsports Baseball (black text)
Robotron 2084 (1986 copyright)
Robotron 2084 (1987 copyright/italics)
Scrapyard Dog
Summer Games
Super Huey
Super Skateboardin'
Tank Command
Title Match Pro Wrestling
Tomcat F-14 (2600 label)
Tomcat F-14 (7800 label)
Touchdown Football
Tower Toppler (black end label text)
Tower Toppler (red end label text)
Water Ski
Winter Games
Xenophobe
Xevious (black/gray pic)
Xevious (black/white pic)